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SUMMARY:Unified Origin of Primordial Black Hole Dark Matter and Nanohertz 
 Gravitational Waves
DTSTART;VALUE=DATE-TIME:20260522T024000Z
DTEND;VALUE=DATE-TIME:20260522T032000Z
DTSTAMP;VALUE=DATE-TIME:20260530T170905Z
UID:indico-contribution-2450@indico.itp.ac.cn
DESCRIPTION:Speakers: Shi Pi (Institute of Theoretical Physics\, Chinese A
 cademy of Sciences)\nRecent high-cadence observations by Subaru-HSC have i
 dentified a population of ultrashort-timescale microlensing events\, provi
 ding a compelling window for planet-mass primordial black holes (PBHs) to 
 constitute the entirety of dark matter. In this Letter\, we demonstrate th
 at this PBH population and the nanohertz stochastic gravitational-wave (GW
 ) background reported by pulsar timing arrays (PTAs) can be naturally unif
 ied by a single primordial origin: a broad\, nearly-flat enhancement of th
 e curvature power spectrum with an amplitude of O ( 1 0 − 2 ) O(10 −2 
 ). The resulting PBH mass function spans the planet-to-solar mass range\, 
 while remaining consistent with all current observational constraints. Thi
 s unified PBH--induced-GW framework makes concrete multi-messenger predict
 ions\, which can be decisively scrutinized by forthcoming microlensing sur
 veys\, next-generation PTAs\, space-borne interferometers\, precision astr
 ometry\, and laser ranging experiments.\n\nhttps://indico.itp.ac.cn/event/
 419/contributions/2450/
LOCATION:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2450/
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